As the project manager of the Rooftop Garden, with the description below:

- Owner: The City of Westbury

- Location: the City Hall in Vancouver

- Scale: 800m2

- Scope: Landscape design and build

- Duration: 2 years (from Jun 2022 to May 2024)

- Budget: $4,500,000

- Deliverables: central garden (500m2) with soft scape and hardscape, outliving space (200m2) with loose furniture, low partition, the small service (100 m2) with the vending machines of snack, soft drink, and restroom

Pls propose 3 positive and 3 negative risks and their mitigation plan, contingency, and fallback plan per each case